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I have a HP Pavillion a6500f, and right now it only has stock components like a OEM 250W PSU and a onboard 128MB GeForce 7100. I plan to purchase newer, more powerful parts like:

My question is, is the 450W Rosewill PSU sufficient enough to power either graphics cards and the Intel E6500 CPU?

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Use Newegg's Power Supply Calculator as there are more factors to be taken into consideration than CPU and GPU.

According to AMD the minimum requirements for the Radeon 46xx series is a 400w PSU, with 450w you wouldn't have much reserves.

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A 450W PSU should be more than sufficient for those specifications.

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according to ATI it's rather 'just about' than 'more than sufficient'. as you know, saving on the PSU is saving at the wrong end. :) – Molly7244 Nov 22 '09 at 23:51
They always state more than required and you said that a 400w is minimum - meaning the 450 is "more than sufficient"... I have had dual SLI systems (on lowish cards) running off of 400w psus, and that looks like a good one looking at the detailed specifications, so I stand by original statement! – William Hilsum Nov 23 '09 at 0:05
and as i said, there are more factors to be taken into consideration, such as number/type of hard drives and optical drives. and while you're perfectly entitled to stand by your original statement, i'd rather spend a few quid extra and be on the safe side with a 500w PSU. but everyone to their own. :) – Molly7244 Nov 23 '09 at 0:50
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